In response to the Decepticon's Pretender Initiative a group of humans want to augment the Autobots. To increase reaction time they design a scheme to fuse human components with transformers. All of the tests until now have been failures.

The humans focus their experiment on a suitable test subject that may promote a higher success rate. They decide on a human that has been exposed to the Allspark as well as the Matrix: Sam Witwicky. Having acquired Sam and Optimus( another ideal candidate) the augmentation forces Optimus back into protoform mode. Were he is provided an alt mode once the powermaster process begins.

Now Optimus weilds more power than ever, however, Sam has to remain within a 50ft radius of Optimus.

To answer some questions, there probably is some gundam influence as I like gundam in general. The trailer makes up a large part of the super mode, but the cab is different to. Its COE style. Cab Over Engine. Or flatnose truck

The sword reminds me of Cloud's sword from the Final Fantasy movie. Although the holes in it are more along the lines of a Prog. Knife from Evangelion. It is an interesting design none-the-less although the torso seems kind of small in comparison to his limbs.

To answer some:
Blitzfire- I was wondering about the flames, But I dont think I need them to add some blue in there. I'll make the cab red, and part of his trailer blue. I just dont think flames would look good on a COE rig.

HiKaizer- I changed the sword a little, hope you like the update

...and I updated the first post, keeping the original in the attached images, changing out the img tags

That totally made my night!!! I don t know Power masters all that well but
I've seen all I need to see to realize that this is one of the best fan arts ive seen in a while. and its probably unintentional, but his sword looks like Clouds buster blade from final fantasy.and I;ll let you know that clouds sword is one my of my fav designs EVA so kudos to ya!!!